<!--  -->
<template>
<!--指定星星大小:使用父组件传递参数-->
  <div class="star" :class="'star-'+size">
    <span class="star-item" v-for="(sc,index) in starClasses" :key="index" :class="sc"></span>
  </div>
</template>
<script>
//解决星星样式问题算法
//(1)创建三个常量分别保存 满星 半星 空星样式
const CLASS_ON="on";
const CLASS_HALF="half";
const CLASS_OFF="off";
export default {
    //定义属性接收父组件传来的数据
    props:{
        score:Number,//分数
        size:Number  //大小
    },
  data () {
    return {
    };
  },

  components: {},

  computed: {
    //添加计算属性
    //计算返回数组["on","on","on","off","off"]
    starClasses(){
      //1获取分数
      const {score}=this;
      //2创建空数组
      const scs=[];
      //3获取分数整数部分
      const scoreInteger=Math.floor(score);//向下取整
      for(var i=0;i<scoreInteger;i++){
        scs.push(CLASS_ON);
      }
      //4计算分数半星部分
      if(score*10-scoreInteger*10>=5){
        scs.push(CLASS_HALF);
      }
      //5计算空星部分
      while(scs.length<5){
        scs.push(CLASS_OFF);
      }
      return scs;
    }
  },

  methods: {}
}

</script>
<style lang='stylus' rel='stylesheet/stylus' scoped>
@import "../../common/stylus/minxns.styl"
.star //2x图 3x图
    float left
    font-size 0
    .star-item
      display inline-block
      background-repeat no-repeat
    &.star-48
      .star-item
        width 20px
        height 20px
        margin-right 22px
        background-size 20px 20px
        &:last-child
          margin-right: 0
        &.on
          bg-image('./images/star48_on')
        &.half
          bg-image('./images/star48_half')
        &.off
          bg-image('./images/star48_off')
    &.star-36
      .star-item
        width 15px
        height 15px
        margin-right 6px
        background-size 15px 15px
        &:last-child
          margin-right 0
        &.on
          bg-image('./images/star36_on')
        &.half
          bg-image('./images/star36_half')
        &.off
          bg-image('./images/star36_off')
    &.star-24
      .star-item
        width 10px
        height 10px
        margin-right 3px
        background-size 10px 10px
        &:last-child
          margin-right 0
        &.on
          bg-image('./images/star24_on')
        &.half
          bg-image('./images/star24_half')
        &.off
          bg-image('./images/star24_off')
</style>